There is only one freshman in the cast of a high school play. there are 6 sophomores and 11 juniors. one third of the cast are seniors? how many seniors?

Let X = total students in musical

Then (1/3) X = number of seniors

  1 + 6 + 11 + (1/3)X = X

              18 + (1/3)X = X

                           18 = (2/3)X

                 (3/2)(18) = X

                          27 = X

27 students in musical of which one third are seniors,  

there are 9 seniors in musical

hope this helped!

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.